[rules-users] Help! Activations firing out of salience order

[Wolfgang Laun]

There used to be a subtle bug in the PriorityHeapQueue containing the
activations.

See https://issues.jboss.org/browse/JBRULES-3044

-W

2011/10/18 Swindells, Thomas <TSwindells at nds.com>

>  In our project we have been experiencing a large number of intermittent
> unit test failures when we are testing our rules (on drools 5.1.1).****
>
> After a lot of debugging, examining our rules for logic errors,
> experimenting and generally scratching our head trying to work out what is
> wrong, we have noticed that sometimes (but very intermittently) activations
> are firing in the wrong order.****
>
> ** **
>
> In our rulebase we have two rules, Rule A salience 80 and Rule B salience
> 70. Whilst debugging we made Rule A and B are identical other than rule B
> having some additional constraints on the end. ****
>
> Dumping out the agenda events we have observed the following actions
> occurring:****
>
> BEFORE_FIRED rule X****
>
> CREATED_ACTIVATION Rule A****
>
> CREATED_ACTIVATION Rule B****
>
> AFTER_FIRED rule X****
>
> ** **
>
> … (no references to either rule/activation)****
>
> ** **
>
> BEFORE_FIRED Rule B****
>
> CANCELLED Rule A****
>
> AFTER_FIRED Rule B****
>
> ** **
>
> How can Rule B be firing before Rule A when both activations exist?****
>
> Does anybody know of any bugs in 5.1.1 that may be causing this? ****
>
> We have a branch of code on 5.3 and that also has had intermittent unit
> test failures, we’ve not had chance to examine whether this is the same
> pattern or just a different logic issue.****
>
> ** **
>
> Please help,****
>
> ** **
>
> Thomas****
>
> ** **
>
> ** **
>
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